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Author McGowan, F. K. ♦ Stelson, P. H.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ CHARGED PARTICLES ♦ COINCIDENCE METHODS ♦ COLLECTIVE MODEL ♦ COULOMB EXCITATION ♦ DECAY ♦ ELECTRIC FIELDS ♦ ELECTRONS ♦ ENERGY LEVELS ♦ ENERGY RANGE ♦ EVEN EVEN NUCLEI ♦ EXCITATION ♦ GAMMA CASCADES ♦ GAMMA RADIATION ♦ MEASURED VALUES ♦ NUCLEAR MODELS ♦ NUCLEI ♦ OSMIUM ♦ PARITY ♦ PLATINUM ♦ PROTONS ♦ SPECTRA ♦ SPIN ♦ TRANSIENTS ♦ TUNGSTEN ♦ VIBRATIONS
Abstract The location of a second 2+ state is established for six -even-even nuclei by means of Coulomb excitation produced by 4 to 5 Mev protons. The relatively weak excitation of these states is detected by a measurement of the gammaray yields from singles spectra and from coincident measurements of the cascade gamma rays. The B(E2)'s for decay of the second 2+ state to ground state by the crossover transition exhibit some uniformity for the even-even isotopes of W and Os, being about 6 times the single-particle value. The cascade/crossover ratio for the decay of the second 2+ state is known for these nuclei. The upper cascade B(E2)'s exhibit enhancements of 10 to 60 times the single-particle value. The ratios of the B(E2)'s for decay of the first and second 2+ states are compared to the predictions of several collective models. For five of these nuclei the E2/M1 ratio is known for the upper cascade transition. The B(M1) values obtained are exceedingly small compared to the single-particle estimate. This result is in qualitative agreement with the collective models which predict that M1 radiation is forbidden in the decay of vibrational excitations. (auth)
ISSN 0031899X
Educational Use Research
Learning Resource Type Article
Publisher Date 1961-05-15
Publisher Department Oak Ridge National Lab., Tenn.
Journal Physical Review
Volume Number 122
Organization Oak Ridge National Lab., Tenn.


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